Double boiler.



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N m W UNITED STATES Patentedllbecember 8, 1903.

:PATENT OFFICE.

DOUBLE BOILER.

SPECIFICATION forming part of Letters Patent No. 746,213, dated December 8, 1903.

I Application filed February 25, 1903. Serial lim-145,085. (No model.)

To all whom it may concern.-

Be it known that I, ANDREW J .WENTZEL, a citizen of the United States, residing atfWest Superior, in the county of Douglas and State of Wisconsin, have invented cert-ain new and useful Improvements in Double Boilers,of which the following is a specification.

This invention has for its object to devise a double` boiler for cooking foodinvolving novelstru'ctural features resulting inthe provision of a utensil in which the inner vessel will he completelysurrounded by the heating medium thereby greatly facilitating the cooking process and enabling independent use of the vessels when required.

The invention consists, essentially, of two vessels each provided with a lateral handle, the smaller vessel being adapted to be suspended within the larger vessel by means'of its handle, which rests upon and projects beyond the handle of the outer vessel to be conveniently grasped, the handles of the two vessels being adapted to normally interlock by a longitudinal sliding movement of the one upon the other.y

For a full description of the invention 'and the merits thereof and also to acquire a knowledge of the details of construction of the means for eecting the result reference is to be had to the following description and drawings hereto attached.

While the essential and characteristic fea'- tures of the invention are susceptible of modiyss cation, still the preferred embodiment of the invention is illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of a double boiler embodying the invention, parts beingv broken away to show more clearly the structural details. Fig. 2 is a view of the handles detached and inverted, showing more clearly the interlocking means. Fig. 3 is a detail perspective view of the handle of the inner Vessel. Fig. 4is a detail perspective View of the handle of the outer vessel.' Figs. 5 andshow modifications of the handles. perspective view of a portion of the outer vessel and its cover, showing clearly the notches formed therein tov provide an opening for the passage of the handle of the inner vessel, the parts being detached.

Corresponding and like parts are referred struction.

Fig. y7 isl a detailv to in the following description and indicated i in all the views of the drawings by the same reference characters.

The boiler. comprises two vessels land 2,` vthe same being of vany size, shape, or cony The vessel l is suspendedA within the vessel 2 so as to be spaced therefrom at its bottom, top, and sides, whereby it is completely enveloped by the heating medium, so

as to attain all the advantages of the inven# tion.- The outer vessel 2 is provided with a handle 3, and the inner vessel 1 is. provided with a similar handle 4,which in practice is of greater length than handle 3, so as to project beyond same and admit of vessel 1 being read- V ily removed or placed within vessel 2 without interference of handle 3 therewith. The handle4islonger than and rests upon handle 3 and sels being held in determinate position by interlocking means between the handles 3 and 4. Eachofthe-vessels is closedl by a cover, which may be of any construction solas to make a comparatively close joint. The cover 5of vessel 2 is notched at one edge, asshown at 6, to provide clearance for handle 4, and

the upper edge of vessel 2 is correspondingly notched, asshown at 7, to receivehandle 4 and act in conjunction with theinterlocking means between 'the two handles to hold ves.- sel 1 in proper position. The notches 6 and 7 are of such size as to admit of a snug opening being formedforthe passage of handle 4.

The handles 3 andl 4 are sufficiently stout to admit of manipulation of the boiler or either vessel comprising same andare riveted kor otherwise secured to the respective vessels in any substantial manner. lThe handle 4 has the longitudinal edge portions of thepart projecting beyond the handle 3 recurved,as shown at 12, and the outer end of the handle3 is reduced in width to form a tongue 13 to enter the space formed between the recurved edge portions 12 and the body of the handle, shoulders 14 being provided at the base ofthe tongue 13'to -limit the sliding movement of handle 4 upon handle 3 when placing vessel 1 within vessel 2.

In 'the construction shown inV Fig. 5 the in loo the opening 8 and underlap handle 3, so as to prevent upward movement of the outer end of handle 1l by the weight of the vessel l.

In the construction shown in Fig. 6 the handle 4J is provided with a headed stud l0, and the end of handle 3b is provided with notch 1l to receive headed stud l0. The stud l() may be secured to the handle 4b in any way, and the notch ll flares toward its outer end to facilitate the entrance of the stud therein, as will be readily comprehended.

A double boiler embodying the invention is exceedingly cheap in construction, admits of the complementary vessels 1 and 2 being Vindependently used, and enables the cooking to be effected in less time than cooking utensils of this type in which the inner vessel has a portion exposed to the outer air. The inner vessel is completely enveloped by a moist heating medium. Hence the food being cooked is prevented from burning or crusting. The vessels are free from inner rims or overhanging portions, which preclude the successful independent use of the outer or inner vessel or boiler of cooking utensils of the aforementioned type as commonly constructed.

Within the purview of the invention it is not necessary that the cover or edge of the outer vessel be notched to receive the handle of the inner vessel, as the two handles lie sufficiently close to admit of the cover making a tight joint.

In all forms of the handles the upper one is considerably longer than the lower one and extends beyond the outer end thereof a distance to be conveniently grasped when placing vessel l within vessel 2 or removingsame therefrom. An important feature is the interlocking of the two handles bya longitudinal movement of the upper handle on the lower handle, same being effected at one operation when placing vessel l within vessel 2. The unlocking is accomplished by a single movement when lifting vessel l from vessel 2 by sliding the upper handle out upon the lower handle. By having the longitudinal edge portions of the handle 4 recul-ved, as stated, a rounded grip is formed to prevent injury to the hand, and the outer portion is stiffened, as well as guides provided to receive the end or tongue 13 of the handle 3, which is protected thereby.

Having thus described the invention, what is claimed as new is- 1. In a double boiler, an outer vessel having a lateral handle, an inner vessel having a corresponding lateral handle to rest upon and project beyond the handle ot' the outer vessel to hold the inner vessel in suspension and to be conveniently grasped, and positive interlocking means between the two handles coupled and uncoupled byalongitudinal sliding movement of the upper handle upon the lower handle when placing the inner vessel in position or removing it from the outer vessel, substantially as described.

2. Adouble boiler comprising an outer vessel havingalateral handle nearits upperedge and a notch in said upper edge adjacent to the handle, an inner vessel having a lateral handle to overlap and rest upon the handle of the outer vessel and pass through the notch thereof, interlocking means between the two handles, and a cover for the outer vessel extending over the inner vessel and having a notch in an edge to match with the notch of the outervessel to provideclearance for the handle of said inner vessel, substantially as set forth.

3. In a double boiler, au outer vessel having-a lateral handle, an inner vessel having a lateral. handle to rest upon the handle of the outer vessel to hold the innervessel in suspension, the upper handle projecting beyond the lower handle and having the longitudinal edge portions of the projecting portion recurved to stiffen same and form a rounded grip, the inner ends of the recurved longitudinal edge portions receiving and embracing the outer end of the lower handle to form interlocking means between the two handles, substantially as set forth.

Ll. In a double boiler, an outer vessel having a lateral handle reduced in width near its outer end to form a tongue and shoulders at the base of the tongue, an inner vessel having a handle to rest upon the handle of the outer vessel to hold the inner vessel in suspension, the upper handle projecting beyond the lower handle and having the longitudinal edge portions of the projecting portion recurved to stiften same and form a rounded grip, the inner ends of the recurved longitudinal edge portions receiving and embracing the tongue at the outerend of the lower handle to form interlocking means between the two handles, substantially as specified.

In testimony whereof I afx my signature in presence of two witnesses.

ANDREW J. WENTZEL.

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